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Klingon history

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Multiple realities
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Qo'noS, late 2367, remastered

Qo'noS, homeworld of the Klingons

Like its people, the history of the Klingon Empire is violent but colorful.

Early HistoryEdit

A "Garden of Eden"-like place known as Qui'Tu played a role in Klingon creation myths. Kortar, the first Klingon, along with his mate then destroyed the gods who created them. (Star Trek V: The Final Frontier; DS9: "You Are Cordially Invited"; VOY: "Barge of the Dead")

In 2369, evidence was discovered that suggests many of the galaxy's humanoid races were descended from a single humanoid race, the originators of the basic anatomy. Around 4.5 billion years ago they had seeded many worlds with a DNA code to guide evolution to a form resembling their own. Klingons displayed evidence of these DNA sequences. (TNG: "The Chase")

Birth of the Klingon EmpireEdit

Kahless painting

A painting of Kahless on Boreth

In the 9th century AD, the Klingon home world Qo'noS was ruled by Molor, a tyrannical dictator who was generally unpopular among the people. Kahless the Unforgettable, a commoner, emerged as a champion of the people, and slew Molor in single combat using the first bat'leth, the Sword of Kahless, in the Battle of Qam-Chee. Here, Kahless and the Lady Lukara fought a pitched battle in the city's Great Hall against the soldiers of Molor. While the rest of the city's garrison fled before the 500 soldiers, Kahless and Lukara stood their ground and defeated the forces. Shortly after their victory, the two began what became known as the greatest romance in Klingon history. The defeat of Molor continues to be celebrated in the Empire through the Kot'baval Festival. (TNG: "Rightful Heir", "Firstborn"; DS9: "Looking for par'Mach in All the Wrong Places") Despite his low birth, Kahless ruled together with his new wife as Emperor of Qo'noS, establishing the First Empire and conquering the Fek'Ihri. Kahless proved to be not only a powerful warrior, but also a wise ruler, establishing a code of honor that was to become the template for Klingon society for centuries to come. (DS9: "The Sword of Kahless", DS9: "Tacking Into the Wind")

The exact time period in which Kahless lived has repeatedly been described with differing numbers. In DS9: "Looking for par'Mach in All the Wrong Places" taking place in 2373, Worf enthusiastically mentions the events in Qam-Chee to have happened "a thousand years ago". In "Rightful Heir" Gowron also states that Kahless has been dead "a thousand years". "Soldiers of the Empire" states that 2373 corresponds to "the year of Kahless 999", which could indicate Kahless' lifetime to have been around 1374 AD. Although these three statements place Kahless' lifetime in the 14th and not the 9th century, it should be taken into account that the length of a Klingon year is unlikely to equal an Earth year, and might therefore be longer. Moreover, "Rightful Heir" mentions the monks on Boreth had been awaiting Kahless' return for "15 centuries", i.e. 500 years longer. This is also in accord with the Sword of Kahless being dated to an age of 1,400 years in DS9: "The Sword of Kahless". Furthermore, a scene cut from "Rightful Heir" had Data specify Kahless' death as 1547 years ago, which places it in 822 AD.
The unfamiliarity of the Kahless clone with the concept of cloning could suggest that Klingons did not yet possess this technology during his original lifetime. However, the clone's mind and memory was constructed by 24th century monks based on historical text, and might therefore be incomplete or erroneous. A cut scene from "Rightful Heir" might also suggest Klingons practiced slavery at this time, as Kahless mistook Troi for a gift to him.

Klingons at one point practiced mummification, allegedly also on Molor. (Star Trek IV: The Voyage Home, TNG: "Firstborn")

The script of Star Trek IV: The Voyage Home identified the mummification glyph as being from the early Zanxthkolt Dynasty.
Paq batlh

An excerpt of the paq'batlh, a large series of ancient Klingon scrolls and religious texts, that, among other things, passed on the stories of Kahless.

Kahless was not just a warrior, but also a philosopher and his words are frequently invoked by warriors about to enter battle. Among his sayings are, "A leader is judged not by the length of his reign, but by the decisions he makes." (DS9: "Tacking Into the Wind") Kahless' legends were recorded in a series of scrolls called the paq'batlh. (VOY: "Barge of the Dead")

Sometime after Kahless united all Klingons, he left. Claiming that he was going to Sto-vo-kor, he pointed to a star and said, "Look for me there, on that point of light." The place Kahless pointed out was later named Boreth, becoming the most sacred place for Klingons. (TNG: "Rightful Heir")

Whether Kahless' words may be interpreted with respect to the space-faring capabilities of Klingons at that time is not known. According to the non-canon Star Trek: Star Charts, the Klingons first achieved warp capability in the Earth year 930 AD, i.e., not long after the time of Kahless. However, according to the manual for Star Trek: Klingon Academy (also non-canon), the Klingons acquired warp drive much later (14th century AD), from the Hur'q during the Hur'q conquest of Qo'noS (see below).

The way to an interstellar empireEdit

Kahless' greatest legacies include not only the creation of the Klingon Empire, but also establishing the position of Emperor, thereby founding a monarchy that endured almost uninterrupted for 1,100 years. Noted emperors include Sompek, remembered for his conquest of Tong Vey, when ten thousand of his warriors laid siege to the city. When Sompek captured Tong Vey, he ordered the entire population massacred, and the city burned to the ground. Emperor Mur'Eq, on the other hand, is known for introducing the use of blunted bat'leths for practice, in order to make sure "his warriors kill their enemies and not each other". (TNG: "Rightful Heir"; DS9: "Rules of Engagement", VOY: "Prophecy")

Sword of Kahless

The Sword of Kahless, one of the most important Klingon artifacts was stolen by the Hur'q.

In the 14th century, the Klingon home world was sacked by a race they called Hur'q (Klingonese for "outsider"). The Hur'q were a powerful race from the Gamma Quadrant, who possibly used the Bajoran wormhole to reach Qo'noS. Although they did not stay long, either because of their nomadic way of life, or because of fierce resistance from the Klingons, they did not leave before looting many valuable cultural treasures, including the revered Sword of Kahless. (ENT: "Affliction"; DS9: "The Sword of Kahless")

The non-canon Star Trek: Klingon Academy video game elaborates that when the ancient Klingons drove off the Hur'q raiders, they were able to capture much of their technology. From those seizures, they were able to reverse-engineer and build their own warp-drive equipped spaceships. This is what allowed the relatively non-technology-oriented Klingons to make the societal jump to being an interstellar power. The simplistic term "outsider" for a specific alien race would be in agreement with the Hur'q being the first off-world species the Klingons ever encountered.

The 14th century is also notable for significant religious changes that took place within Klingon society, giving rise to a new cultural outlook which was later described as "Klingon warriors, who set out and slew all of their gods, because they were more trouble than they were worth." (DS9: "Homefront")

In the beginning of the 16th century, the Second Dynasty ruled over the Klingon Empire. It was ended when General K'Trelan assassinated Emperor Reclaw and later put to death all the members of the Imperial Family. During the next ten years, the Empire was ruled by a council elected by the people, which is referred to as "The Dark Time" by Klingon historians. Following this unique but brief period of democracy, a new group of Klingons, called the Third Dynasty, was given the titles and names of the original Imperial Family, in order to create the illusion of an unbroken line, since the true Imperial bloodlines were cut at the end of the Second Dynasty. (DS9: "You Are Cordially Invited")

According to Quark, Klingons achieved warp drive sometime after 1947. By the year 2152, Klingon vessels were capable of warp 6. (DS9: "Little Green Men"; ENT: "Judgment")

It is stated in the Star Trek: Star Charts (p. 55) that Klingons had achieved warp capability in the year 930, which is a reference to the Boreth monastery being built shortly after Kahless' death. However, Quark specifically stated in "Little Green Men" that the Ferengi would have had warp drive before the Klingons, had he delivered warp technology to Ferenginar in 1947. See Little Green Men - Trivia for more information.

In the mid-21st century, the imperial monarchy, which claimed to trace its origins to the legendary warrior Kahless, came to an end when the last Emperor died and the leadership of the Empire fell to the Chancellor of the Klingon High Council. (TNG: "Rightful Heir")

During the Second Empire, Chancellor Mow'ga sent a fleet to conquer the Breen, but it was never heard from again. (DS9: "'Til Death Do Us Part")

The time period of the Klingon "Second Empire" was not mentioned on screen. However, due to Chancellor Mow'ga's apparent authority, it is likely set after the reign of the last Emperor ended.

According to Tuvok, it was due to the Klingons being outlaws as well as their violent and brutal behavior that the stability of the quadrant as it was in the late 21st century would not be achieved again until the late 23rd century. (VOY: "Alliances")

In the alternate reality, in 2259, Admiral Marcus was among those who labeled the Klingons as outlaws. (Star Trek Into Darkness)

22nd century Edit


The Klingon capital on Qo'noS in 2151

By the 22nd century, the Klingons were a major regional power, fielding a formidable military, referred to as the Klingon Defense Force. (ENT: " Affliction", "Divergence")

Klingon forays into space up until the middle of the century included a starship, which attempted to enter the Delphic Expanse in 2133. When it reemerged, the entire crew was anatomically inverted but still alive. After this incident, the Klingon High Council forbade all ships from entering the Expanse. (ENT: "The Expanse") At least one Klingon starship had encountered the Automated repair station by 2152, and lost a crew member to it. (ENT: "Dead Stop") Several years before 2154, the Organians, a race of massively powerful noncorporeal beings, covertly observed Klingons leaving behind a garbage dump on a planet. The Organians were studying how different ship crews were responding to a deadly, contagious silicon-based virus their landing parties contracted on the planet. The Klingons were said to have denied the infected back aboard and their Commander eventually had their craft destroyed, killing the landing party. (ENT: "Observer Effect")

In the late 2140s and early 2150s, the Klingons were engaged in a fierce internal struggle that, while not amounting to actual civil war, threatened to become a more intense conflict. Numerous attacks had taken place throughout the empire that were blamed on various Klingon factions; it was not realized at the time that the attacks had actually been launched by the Suliban Cabal, who were taking orders from a mysterious individual who was an operative in the Temporal Cold War. (ENT: "Broken Bow")

Early contact with Humans Edit

Klaang confronts the Klingon Chancellor

Klaang provides the Klingon High Council with proof that the Suliban Cabal was behind attacks against the Empire in 2151

Although the Klingons had occasional contact with the Vulcans prior to 2151, they had not met Humans until the Broken Bow Incident, in which a courier named Klaang crashed on Earth while pursued by two Suliban soldiers. After dispatching his two pursuers, Klaang was shot by a local farmer named Moore. Although Vulcan ambassador Soval advised that Starfleet authorities withhold medical treatment and allow Klaang to die, Captain Jonathan Archer intervened and insisted on returning Klaang to Qo'noS aboard his ship, Enterprise NX-01.

Archer, however, did not understand the complexity or importance of Klingon tradition, and did not realize that returning Klaang to Qo'noS was a grave dishonor and insult. However, Klaang carried with him proof that the attacks were in fact launched by the Suliban, which averted a civil war. For this service, Archer and his ship were allowed to leave peacefully. (ENT: "Broken Bow") That incident fostered Klingon enmity towards Humans and was widely recognized as setting the stage for decades of future war. (TNG: "First Contact")


By 2153, the Klingon society, including its judicial system, was dominated by the warrior caste and honor only had a superficial meaning during trials

In early 2153, the Empire again encountered the Enterprise when the Human ship rescued a refugee ship from Raatooras that was attempting to flee Klingon territory. Captain Archer chose to render assistance to the refugees, but failed to realize the ramifications of his actions, particularly the embarrassment he would cause the Klingons. When the Klingons demanded that the refugees be handed over for trial, Archer refused to comply. Captain Duras of the IKS Bortas intercepted the Enterprise and attacked it, unsuccessfully. Archer was later captured and brought to trial on Narendra III, a Klingon colony, for being an "enemy of the state." In an incendiary tribunal, Archer's "interference" with Klingon affairs earned him a life sentence to Rura Penthe. Archer managed to quickly escape from the prison, due to the rescue efforts of his crew, further embarrassing the Klingons. (ENT: "Judgment")

The Klingons launched several further attempts to recapture Archer, including hiring bounty hunters (ENT: "Bounty") and sending Duras himself to track the Enterprise and recapture Archer. Duras was unsuccessful in three different attacks against the Enterprise, and he was finally killed when the Enterprise destroyed his ship during the third attack, on one of the edges of the Delphic Expanse. (ENT: "The Expanse")

Augment Crisis Edit

D5 class grappled

On its way to apprehend the rogue Human Augments in 2154, Enterprise disables a D5 class battle cruiser

The Klingon Empire nearly went to war with Earth during the Augment Crisis in May 2154, when a group of genetically-engineered Humans hijacked a Bird-of-Prey and ejected its crew into space. In response, the Empire sent scout ships to the vicinity of the Human Proxima colony. Planning to devastate humanity, the Augments tried to escalate the incident by annihilating the Klingon Qu'Vat Colony with a biogenic weapon. Fortunately, war was averted when Enterprise destroyed the rogue Humans responsible and saved the colony. (ENT: "Borderland", "The Augments")

A short time later, the Klingons found genetic material of the Human Augments within the wreckage of the hijacked Bird-of-Prey. Fearing that Starfleet may be attempting to create genetically-superior Humans to take over the Empire, they tried to adapt this genetic engineering to improve themselves. An unanticipated side effect was that the Augment DNA caused the Klingon cranial ridges to dissolve. The test subjects did gain increased strength and intelligence, but then their neural pathways started to degrade and they died in agony. One of the subjects was suffering from the Levodian flu, which was modified by the Augment genes to become a deadly, airborne plague that spread rampantly within the Empire posing its gravest threat since the Hur'q invasion. In the first stage of this plague, a Klingon's physiology mutated to become more Human, for which the degeneration of the cranial ridges was a symptom.

Klingon cranial ridges dissolve

A Klingon suffering from the Klingon augment virus in 2154

With the help of a Klingon scientist named Antaak, Dr. Phlox of the Enterprise was able to formulate a cure that halted the genetic effects of the virus in the first stage, retaining the changes in appearance along with some minor neural re-ordering, but with no development of stage two characteristics, such as enhanced strength, speed or endurance. This left millions of Klingons, mostly in the warrior caste, without their ridges. As these alterations were even passed on to their children, Phlox and Antaak theorized, that surgical cranial reconstruction might become quite popular for Klingons, who want to restore their outer appearance. Nevertheless, this whole incident embarrassed the Klingons even further and the Empire no doubt began to feel much more contempt for Humans, who were responsible for creating the genetic material in the first place. (ENT: "Affliction", "Divergence")

It remains unclear when and if a final cure for the Augment virus was found. Any Klingon shown originally without cranial ridges in TOS and then with them in subsequent time periods (e.g. Kang, Koloth and Kor), might simply have undergone surgical reconstruction of their cranial ridges. Other differences in attitude and methodology between the TOS and non-TOS Klingons can perhaps be attributed to the neural re-ordering caused by the virus.

23rd century Edit

Klingon-Federation Cold WarEdit

Main article: Federation-Klingon Cold War

By 2223, relations had degraded to a point where the Klingon Empire and the Federation were constantly on the verge of war. (Star Trek VI: The Undiscovered Country; ENT: "In a Mirror, Darkly, Part II")

Based on conjecture derived from dialogs in Star Trek VI: The Undiscovered Country, TNG: "First Contact", and a deleted line from TOS: "Day of the Dove", it was originally believed that First Contact between the Federation and the Klingon Empire took place in the 2220s, and immediately led to the state of cold war that lasted until 2293. However, Star Trek: Enterprise revises these theories, placing the first contact in 2151. Furthermore, in TOS: "The Trouble with Tribbles", Spock states that the dispute over the area around Sherman's Planet began immediately after First Contact with the Klingons, meaning that the political status of this region of space must have been unclear since the 2150s.

The Federation was quickly expanding, and its territory began to approach that of the Empire. Conflicts over ownership of various star systems arose, e.g. the inconclusive Battle of Donatu V in 2245. Other disputes included Sherman's Planet, the Archanis sector and Organia. Both sides refrained from committing to open warfare, although numerous skirmishes were fought between the Federation Starfleet and Klingon forces during this time.

Kor, 2266

Kor, commander of the Klingon forces occupying Organia in 2267

However, in 2267 negotiations between the two sides broke down and the Federation officially declared war against the Empire. The Klingons launched an immediate offensive, seizing several planets, including the strategically important Organia. Unexpectedly, the Federation-Klingon War was brought to a sudden conclusion just days after it had begun, when the Organians, noncorporeal beings who had covertly observed both Klingons and Humans more than 100 years earlier, intervened and forced both sides to end hostilities. The Treaty of Organia was then imposed, establishing a neutral zone separating the two powers and instituting a procedure, to be overseen by the Organians, through which planets along the border could be claimed and settled by both sides. (ENT: "Observer Effect", TOS: "Errand of Mercy", "The Trouble with Tribbles", DS9: "Apocalypse Rising")

A number of skirmishes and hostile encounters between the Klingons and the Federation occurred over the next decade, including encounters at Capella IV, Neural, Elas and Beta XII-A. In most of these confrontations, the Klingons tried to gain strategic advantage and secure mining rights for valuable minerals, such as dilithium. (TOS: "Friday's Child", "A Private Little War", "Elaan of Troyius", "Day of the Dove")

Kor's undated attack on a Federation outpost on Caleb IV mentioned in DS9: "Once More Unto the Breach" might also be part this series of skirmishes.
Klingon ambassador and Kirk image

In 2286, the Klingon ambassador demands that the Federation Council extradite the "terrorist" James T. Kirk.

Tensions between the Klingons and the Federation again came to a head in the 2280s with the revelation of the secret Project Genesis, a scientific program developing an advanced method of quickly terraforming worlds – but a method which also had great potential for causing destruction. While the Klingon Empire was negotiating openly with the Federation, a Bird-of-Prey under the command of Commander Kruge tried to covertly obtain the secrets of the Genesis Planet. The Klingons planned to accuse the Federation of duplicity in developing Genesis as a weapon of awesome power and using the negotiations as a cover. (Star Trek III: The Search for Spock) However, when the crew of the USS Enterprise, commanded by James T. Kirk, managed to capture the Bird-of-Prey, Ambassador Kamarag proclaimed a vendetta against Kirk in 2286, vowing, "There shall be no peace, so long as Kirk lives!" (Star Trek IV: The Voyage Home) Because of this, as well as Kirk's previous history with the Klingon Empire, some Klingons considered him a revered figure and worthy opponent. In 2287, commander Klaa took his Bird-of-Prey all the way to Qui'Tu beyond the Great Barrier at the center of the galaxy to pursue Kirk and the USS Enterprise. However, General Korrd, who was aboard the Enterprise, stopped him from continuing his renegade personal undertaking. (Star Trek V: The Final Frontier)

Intermittent developments Edit

On stardate 4326.3, Orion merchant raiders attacked Klingon strategic material outposts in the Shepard sector. However, in what would become known as the Feira Incident, the Klingon patrol forces under the command of Korrd were unable to stop the Orions, resulting in Korrd to fall into disgrace with the High Council. (Star Trek V: The Final Frontier, okudagram)

While no definite transformation is possible, stardate 4326.3 should fall within the 2260s.
Romulan flagship, TEI remastered

A D7 class battle cruiser, which was stated to be an originally Klingon design, equipped with Romulan cloaking technology

By 2268, Klingon D7-class cruisers were used by Romulans, who retrofitted them with cloaking devices, a technology believed to be a unique Romulan strategic advantage at that time. The following year, Starfleet, namely Cmdr. Spock, assumed the IKS Klothos under Cmdr. Kor to possess cloaking capability. Kor would later reminisce that, when his ship was equipped with a cloaking device, it was still considered a very new technology in the Empire. In 2285, at least one Klingon vessel definitely was able to cloak itself. (TOS: "The Enterprise Incident", TAS: "The Time Trap"; Star Trek III: The Search for Spock; DS9: "Once More Unto the Breach")

In 2271, Kor led the Klingon Empire to a memorable victory over the Romulan Star Empire in the Battle of Klach D'kel Brakt. By 2292, Romulans and Klingon regarded each other as "blood enemies". (DS9: "Blood Oath", TNG: "Reunion")

Spock specifically identifies some Romulan D7-class battle cruisers in "The Enterprise Incident" to be of Klingon design. This, as well as the Klingons, specifically Kor's Klothos, allegedly possessing cloaking capability the following year might indicate some sort of technology exchange. The Battle of Klach D'Kel Brakt between both sides in 2271, i.e., just two years later, seems to imply that Romulan-Klingon relations were in particular flux during this time.

On two occasions in the 2270s and 2280s, Klingon vessels fell victim to space probes of at least partially unknown origin, which eventually turned out to be Earth-bound. In the 2270s, the entity V'ger neutralized three K't'inga class cruisers whereas another mysterious probe disabled two Klingon vessels in 2286. (Star Trek: The Motion Picture, Star Trek IV: The Voyage Home)

An infamous criminal called "The Albino" launched numerous raids against Klingon colonies, prompting the Empire to dispatch three battle cruisers under the commands of Kor, Kang, and Koloth to apprehend him in 2290. Although his raids were stopped, The Albino could not be captured and would soon take revenge against the three commanders by killing their fistborn sons. (DS9: "Blood Oath")

Peace with the Federation Edit

Although negotiations had proceeded intermittently since the imposition of the Organian Peace Treaty in 2267, no major progress was made in establishing any firm relationship between the Klingons and the Federation. In that same year, a brief but ultimately unsuccessful thawing in relations occurred between the Federation, the Klingon Empire, and the Romulan Star Empire, with the founding of a jointly-managed colony on Nimbus III. Dubbed the "planet of galactic peace," the colony quickly became an embarrassing failure for all three governments, although regular meetings, including Klingon representative General Korrd, did take place at the colony for at least the next twenty years. (Star Trek V: The Final Frontier)

A more notable meeting, on the other hand, was a series of negotiations at the Korvat colony in 2289, where Federation mediator Curzon Dax met with Kang. No lasting agreement was reached at this meeting, but Dax did manage to gain grudging respect from the Klingons and establish a lasting rapport. (DS9: "Blood Oath")


In 2293, Chancellor Gorkon raises a toast to "the Undiscovered Country - the future..."

The situation abruptly changed with the explosion of the Klingon moon Praxis in 2293. The disaster caused major problems for the Klingon economy and military, as well as a major ecological crisis on Qo'noS itself. The Chancellor of the Klingon High Council, Gorkon, took the controversial move of proposing a full peace treaty and establishing a process for dismantling the military fortifications and outposts along their mutual border – the military emplacements and warships that the Klingons could no longer afford.

However, peace did not come easily. While en route to a meeting with the Federation President on Earth, Gorkon was assassinated by two crewmen from the USS Enterprise-A, who were part of an extensive conspiracy opposed to any peace treaty between the two enemies and including members of both sides, e.g., Admiral Cartwright and General Chang, as well as Romulan Ambassador Nanclus. Gorkon's daughter, Azetbur, was appointed as the new chancellor in her father's place. Despite enormous pressure from her advisers to abandon the peace initiative, she chose to press forward and see her father's vision fulfilled. The ensuing Khitomer Conference resulted in the signing of the Khitomer Accords, a treaty which became the foundation for peace between the Federation and the Klingon Empire. For the Romulans on the other hand, it would become a defining motive of the coming decades to re-shift the balance of power by sabotaging this peace. (Star Trek VI: The Undiscovered Country; TNG: "Reunion", "The Mind's Eye")

24th century Edit

Klingon-Federation détente and Romulan aggressionEdit

USS Enterprise-C

The sacrifice of the USS Enterprise-C in 2344 proved instrumental in maintaining and expanding the détente between the Klingon Empire and the Federation

Despite the Khitomer Accords of 2293, Klingon-Federation relations remained rocky for the following decades, although negotiations for a new peace treaty had begun by 2344. (TNG: "Yesterday's Enterprise")

There has not yet been any canon information on Klingon history between 2293 and 2344. However, non-canon sources such as the Lost Era novel The Art of the Impossible place intermittent conflicts with the Cardassians, including the Betreka Nebula Incident, within this timeframe.

That same year, a single courageous act by the crew of a Federation starship finally changed relations for the better, when the USS Enterprise-C responded to a distress signal from the Klingon outpost on Narendra III, which was under attack by the Romulans. Despite overwhelming odds, the Enterprise-C rushed to the rescue and was destroyed. The crew's conspicuous heroism and ultimate sacrifice, in attempting to protect potential enemies, left a lasting impression on the Klingons, paving the way to further rapprochement towards the Federation. (TNG: "Yesterday's Enterprise")

It had not been exactly clarified how tense the relations between the Empire and the Federation really were by 2344. As the temporary removal of the Enterprise-C from the primary timeline resulted in a fierce war between the two powers in an alternate 2366, we might assume that the situation was very volatile, despite the ongoing talks for a new peace treaty. Although never established in canon, this treaty had been theorized to be the later mentioned Treaty of Alliance.

In 2346, two years after its attack on Narendra III, but at a time when it was supposed to be "an ally" of the Klingons, the Romulan Star Empire attacked the Klingon planet Khitomer and killed almost all of the 4,000 colonists. The raid was made possible by the traitor Ja'rod of the House of Duras, who supplied the Romulans with the deactivation codes of the colony's defensive shields. With the USS Intrepid it was again a Federation vessel to be the first ship responding to the distress signal. (TNG: "The Neutral Zone", "Sins of the Father")

The remark on a possible Klingon-Romulan Alliance at the time of the Khitomer Massacre is based on the TNG episode "The Neutral Zone," where Worf states, "Romulans killed my parents in an attack on Khitomer, at a time when they were supposed to be our allies." It is plausible to assume that their official relations have been very erratic over the 23rd and 24th centuries (see Romulan-Klingon relations).

In 2350, Romulan forces made a foolhardy attempt to board Klingon General ShiVang's flagship. Following the ensuing battle, Martok, future Chancellor of the Klingon High Council, is given a battlefield commission in the Klingon Defense Forces. That same year, a Klingon attack costs the lives of later Romulan Praetor Neral's family. (DS9: "Once More Unto the Breach", "Inter Arma Enim Silent Leges")

Around 2349, relations between the Klingon Empire and the Federation were still described as "not too cordial." (VOY: "Faces") The mediator Riva gained fame for negotiating several treaties between the Federation and Klingon Empire; before Riva, there was no Klingon word for "peace-maker." (TNG: "Loud As A Whisper") By 2353, the Treaty of Alliance was signed, finally establishing a firm friendship between the two former enemies – just as the Organians had predicted almost eighty years before. Sarek of Vulcan as well as his son Spock were key figures in devising and negotiating the treaty. (TNG: "Yesterday's Enterprise", "Sarek"; DS9: "The Way of the Warrior"; VOY: "Alliances") The Klingons even joined the Federation in some fashion, some time after 2327 but before 2365. (TNG: "Samaritan Snare")

The comment on the Klingons being some part of the Federation made in "Samaritan Snare" may be in fact referring to the Treaty of Alliance, creating a firm alliance between the two powers.
Federation-Romulan-Klingon stand-off

Klingon Birds-of-Prey assist the Enterprise-D against Romulan Warbirds in 2366.

The Klingon-Federation alliance enabled several strategic cooperations. As part of an Officer Exchange Program, Klingon as well as Starfleet personnel served aboard each other's vessels during the 2360s, including Commanders William T. Riker and Kurn, but also exobiologist J'Dan, who turned out to be spying on behalf of the Romulans, however. (TNG: "A Matter Of Honor", "Sins of the Father", "The Drumhead") In 2365, a Klingon cruiser passed on information to Starfleet about debris of the ancient Earth vessel Charybdis which it had detected at Theta VII. (TNG: "The Royale") Later that year, the USS Enterprise-D and special emissary K'Ehleyr assisted the Klingon Empire in retrieving the sleeper ship IKS T'Ong, which had been dispatched on a "crucial" long-range mission in 2290 and, thus, was unaware of the peace between the Klingons and the Federation. (TNG: "The Emissary") The following year, three Klingon Birds-of-Prey assisted the Enterprise-D in escaping a hostile situation against two Romulan Warbirds in orbit of Nelvana III. (TNG: "The Defector") In 2367, the Klingon Empire provided a Bird-of-Prey to Cpt. Picard and Lt. Cmdr. Data, who required cloaked passage to Romulus for a covert mission. (TNG: "Unification I", "Unification II")

The Klingon-Federation alliance remained a thorn in the flesh of the Romulan Star Empire, and its dissolution, or ideally a new Klingon-Federation war, were an important strategic aim for the Romulans and an appealing alternative for some Klingons, who thought they had become weak due to the alliance. While a cooperation between Romulan Cmdr. Sela and Klingon Ambassador Kell in 2367, which was intended to frame Starfleet for providing weapons to separatist rebels on the Klingon colony Krios and even murdering the local governor Vagh, was unveiled and thwarted, other attempts at subterfuge culminated in the Klingon Civil War (see below). (TNG: "Reunion", "The Drumhead", "The Mind's Eye")

Borg threat Edit

Klingon-Borg encounter

Unspecified battle between the Klingon Defense Force and a Borg cube.

In 2366, the Federation was attacked by a Borg cube. Shortly before the ensuing Battle of Wolf 359, Starfleet requested Klingon assistance for Admiral J.P. Hanson's fleet awaiting the attacking Borg cube. Apparently, the battle began before the Federation fleet could be reinforced. After the destruction of Hanson's taskforce, Locutus of Borg stated that "the Klingons will also be assimilated." (TNG: "The Best of Both Worlds, Part II") The number of Borg drones of Klingon origin encountered by the crews of the USS Enterprise-E and the USS Voyager indicates that the Empire, too, was exposed to the aggression of the Borg Collective. While the number and nature of these encounters are unknown, Voyager's first officer Chakotay, during a neural link with the Cooperative, became aware of at least one pitched battle the Empire fought against a Borg cube of the same type that engaged Starfleet in the Battle of Wolf 359. The Klingon Defense Force fared little better than its Federation counterpart in the unspecified battle. (Star Trek: First Contact, VOY: "Unity", "Infinite Regress", "Unimatrix Zero")

The battle scene shown in Unity was stock footage from DS9: "Emissary" and DS9: "The Way of the Warrior", newly edited in post-production.

Civil war Edit

Main article: Klingon Civil War

K'mpec, Chancellor of the Klingon High Council in 2366

Despite the establishment of a full peace treaty with the Federation, the Empire did not remain at peace for very long. During the reign of K'mpec, the longest-lived chancellor in Klingon history, two rival factions developed in the Klingon High Council. One, led by Duras, who was also secretly allied with Romulan interests who were seeking to split the Federation-Klingon alliance, advocated setting an independent and aggressive policy. In 2366, K'mpec, with the help of Worf, son of Mogh, even had to conceal the treason committed on Khitomer 20 years earlier by Duras' father, Ja'rod - simply to avert civil war. The other faction was led by Gowron and favored continuing the peaceful relationship with the Federation. After K'mpec died of poisoning in 2367, the two factions were on the verge of starting a new civil war. (TNG: "Sins of the Father", "Reunion")

Although Duras was killed by Worf and his relationship with the Romulans exposed, Duras' sisters, Lursa and B'Etor, continued the struggle in their brother's place. They presented Toral, the illegitimate son of Duras, to challenge Gowron for leadership of the Council. Because the majority of the Council had been corrupted by the House of Duras, they sided with the Duras sisters and walked out of the Council when Arbiter of Succession Jean-Luc Picard rejected Toral's claim, making official the division of the Empire. (TNG: "Redemption")

Qo'noS burns

The First City on Qo'noS burns during the Klingon Civil War in early 2368.

The civil war, when it finally broke out, was as bold and bloody as any other conflict in Klingon history. The warriors of the Empire threw themselves into the fight with typical zeal – for example, Kurn was heard to shout, "Our time for glory is here!" In the first three engagements, the forces allied with the Duras family decisively defeated Gowron's allies. However, it was not generally realized at the time that the Duras forces were secretly receiving material aid from the Romulan Star Empire, namely from Commander Sela and General Movar. The Romulans hoped that a victorious Duras family would end the Federation-Klingon alliance, creating a new Klingon-Romulan alliance to shift the balance of power in the quadrant.

However, interests in Starfleet recognized the probability that the Romulans were interfering in the conflict. Jean-Luc Picard and the USS Enterprise-D led a fleet of starships to the Romulan-Klingon border, establishing a blockade and preventing the Romulans from sending the Duras forces further assistance. When the Romulan connection was finally revealed, support quickly fell away from the Duras family, and Gowron successfully reunited the Empire under his leadership. Although he generally kept a pro-Federation stance for the time being, Gowron quickly moved on to "rewrite" history in order to downplay Starfleet's part in his victory. (TNG: "Redemption II", "Unification I")

The "Return" of the Emperor Edit


The clone of Kahless in 2369

By 2369, the clerics of Boreth acquired the necessary technology to "recreate" a clone of Kahless the Unforgettable using DNA from the Knife of Kirom and imprinting Kahless' memories, as written down in the sacred texts (most likely the paq'batlh), in the clone's synaptic pathways. The clerics' plan was to counter the corruption and dishonor in the Empire, by restoring a strong leadership and reinstating the position of Emperor of the Klingon Empire. "Kahless'" ascension to this post should follow his faked return from Sto-vo-kor; however, worrying about his chancellorship, Gowron was able to expose the plan of the clerics. Lieutenant Worf thereby suggested that the clone of Kahless be made Emperor, but only in the sense of a moral leader for the Klingon people with Gowron remaining chancellor of the Klingon High Council. (TNG: "Rightful Heir")

Dominion-instigated conflicts with Cardassia and the Federation Edit

See also: Dominion cold war, Klingon-Cardassian War and Federation-Klingon War (2372-73)
IKS NeghVar attack

The Klingon flagship Negh'Var attacks Deep Space 9 in early 2372

In 2369, the Bajoran wormhole leading to the Gamma Quadrant was discovered – a find with profound implications for the geopolitical situation including the history of the Klingon Empire. The Klingons showed an early interest in exploring the Gamma Quadrant by dispatching scout ships and freighters. The IKS Toh'Kaht was among the first ships to explore the quadrant in an effort to establish colonies beyond the wormhole. After a Vulcan expedition discovered the Shroud of the Sword of Kahless at an ancient Hur'q outpost in the Gamma Quadrant in 2372, Dahar Master Kor, along with Lt. Cmdr. Dax and Worf, set out to find and retrieve the sword itself. Fighting off an attempt to steal the sword by Toral, son of Duras, the three soon realized that its symbolic power would tear the Empire apart and decided to leave it adrift in space in the Gamma Quadrant. (DS9: "Q-Less", "Dramatis Personae", "The Storyteller", "The Sword of Kahless")

The Federation-Klingon alliance was sorely tested in the 2370s, in the wake of the Federation's First Contact with the Dominion, a major hegemonic power from the Gamma Quadrant. The leaders of the Dominion, the Founders, had the express goal of conquering all of the powers of the Alpha Quadrant, in order to prevent them from ever threatening the Great Link. (DS9: "The Search, Part II") In late 2371, the Dominion captured General Martok, a trusted adviser to Gowron, replacing him with a Changeling impersonator. (DS9: "Apocalypse Rising", "In Purgatory's Shadow")

The Changeling posing as Martok convinced Gowron that the recent civilian uprising in the Cardassian Union had been engineered and supported by the Dominion, and that the uprising heralded an imminent invasion by the Dominion into the Alpha Quadrant. To prevent this invasion from occurring, Gowron launched a massive assault against the Cardassian Empire in early 2372. Emperor Kahless condemned the invasion, but was eventually overruled by Gowron, whose goal was to conquer all Cardassian territories to ensure that it could not be taken by the Dominion.

When the Federation Council protested Gowron's actions, Gowron took it as a betrayal of the alliance and withdrew from the Khitomer Accords, ending the Federation-Klingon alliance. Although no declaration of official hostilities was made, a state of near-war developed between the two powers. The Klingons even launched a preemptive attack against the Federation outpost Deep Space 9, in order to capture the remaining free members of the Cardassian Detapa Council. However, Deep Space 9 Captain Benjamin Sisko pointed out to Gowron that a war between the Federation, the Klingons and the Cardassians was exactly what the Dominion wanted – a divided Alpha Quadrant that would be ripe for conquest in the future. Faced with this reasoning, Gowron called an end to the invasion and halted the attack against DS9. (DS9: "The Way of the Warrior")

However, peace did not return. The Federation had refused to fight alongside their allies and had actually sided against them in battle and the Klingons could not forgive or forget this transgression easily. A tense stand-off developed over the next year, with the Klingons attempting to make political inroads against both the Cardassians and the Federation to justify their offensives. (DS9: "Sons of Mogh", "Rules of Engagement")

Finally, in late 2372 and at the Martok Changeling's suggestion, Gowron demanded that the Federation relinquish claims to a number of territories along their mutual border, namely the Archanis sector or face war. When the Federation Council refused the demands, the Empire launched an invasion with battles fought for Archanis IV, Ajilon Prime and Ganalda IV. The Federation-Klingon War was brutal, but short – only a few weeks after it began, Gowron called an end to the conflict after a Starfleet covert ops team revealed that Martok was actually a shapeshifter and the entire war had been engineered to divide the two former allies. However, some hostilities continued after Gowron's ceasefire and were only ended when the Dominion began its invasion of the Alpha Quadrant. (DS9: "Broken Link", "Apocalypse Rising", "Nor the Battle to the Strong", "By Inferno's Light")

The Dominion War Edit

See main article: Dominion War

Khitomer Accords

Facing the imminent threat of a Dominion attack, Klingon Chancellor Gowron re-signs the Khitomer Accords in 2373

When the Dominion annexed the Cardassian Union in mid-2373, the Klingons were quickly defeated by the Jem'Hadar and driven from all of their Cardassian conquests. Faced with the prospect of a larger war against a much more powerful enemy, Gowron agreed to re-sign the Khitomer Accords and renew the alliance with the Federation. In addition, a detachment of Klingon soldiers was assigned to Deep Space 9, commanded by the real Martok, who had been rescued from a Dominion internment camp. (DS9: "By Inferno's Light")

Klingon fleet, Sacrifice of Angels

Klingon forces relieve the Federation fleet during Operation Return in 2374

The Empire and the Federation ultimately fought side by side in the ensuing Dominion War that broke out in late 2373. Many of the most important engagements of the war were conducted in concert, including the Second Battle of Deep Space 9, the attack on Torros III and Operation Return. (DS9: "Call to Arms", "Sacrifice of Angels")

The anti-Dominion alliance gained new, unlikely allies in mid-2374 when the Romulan Star Empire declared war against the Dominion. Although the Romulans and the Klingons both harbored deep hatred for one other, the two former enemies managed to put aside their differences, in order to successfully fight the Dominion. (DS9: "Tears of the Prophets")

However, ultimate victory eventually came at a very high price. When the Breen Confederacy entered the war in late 2375, the use of the previously-unknown energy dampening weapon effectively nullified the power of Starfleet and the Romulan forces. Klingon ships were the only ones which could be adapted immediately, but despite quickly deploying 1500 vessels the Klingons where still outnumbered twenty-to-one. Rather than fight a holding action, Gowron ordered that Martok launch a full-scale offensive against the enemy, claiming that they had the advantage of surprise. (DS9: "When It Rains...")

Ostensibly, Gowron hoped to achieve quick victory against the Dominion and claim all of the glory for the Empire in winning the war, without the assistance of the Federation or the Romulans. But Gowron's real plan was much more subversive and political. Gowron feared the growing popularity of Martok, who had commanded the Klingon forces on the front lines and was rapidly gaining heroic status among the soldiers of the Empire. Gowron hoped to reclaim some of that popularity for himself, by personally commanding the Klingon war effort from Deep Space 9 and by discrediting Martok in sending him on numerous hopeless missions.

When no other Klingons protested, Worf challenged Gowron to personal combat, claiming that Gowron was a coward for jeopardizing the very existence of the Empire (and indeed the safety of the entire Alpha Quadrant), in order to satisfy his need for political security. Worf killed Gowron in the fight, thus claiming the right to rule the Empire himself; however, Worf declined the position and nominated Martok instead, who was subsequently proclaimed the new Chancellor of the Klingon High Council. (DS9: "Tacking Into the Wind")

Female Changeling signs Treaty of Bajor

With the signing of the Treaty of Bajor, the Dominion War is finally ended in 2375

Ultimately, the Empire shared in victory with the Federation and the Romulans, after the final defeat of the Dominion at the Battle of Cardassia in late 2375, during which Chancellor Martok himself led the Klingon forces. Standing amid the ruins of Cardassia, Martok had to drink his bloodwine by himself, however, as Cpt. Sisko and Admiral Ross lost their thirst in the face of all the destruction and death. (DS9: "What You Leave Behind")

Section 31 estimated that the Klingons would not recover from their losses from the Dominion War until about 2385. (DS9: "Inter Arma Enim Silent Leges")

Timeline Edit

Alternate timelines Edit

During the 23rd century in the alternate reality, 47 Klingon Warbirds were destroyed by the Narada, a Romulan mining vessel from 2387 of the prime reality. Nyota Uhura received the transmission, allowing her to verify James T. Kirk's suspicions that the ship was making a reappearance over Vulcan. (Star Trek)

Starfleet admiral Alexander Marcus believed war with the Klingons was imminent and recruited Khan Noonien Singh to design ships and weapons, including the Dreadnought-class USS Vengeance. Khan betrayed Marcus and transwarp beaming to an uninhabited region of Qo'nos. Captain Kirk, Spock and Uhura tried to capture him without alerting the Klingons, but were unsuccessful. Khan came to their rescue, singlehandedly killing the Klingons before submitting to the Starfleet officers. Afterwards, Marcus warned the incident would further exacerbate tensions between the Federation and Klingon Empire. (Star Trek Into Darkness)

In an alternate timeline, the Klingons took control of Deep Space 9 after the death of the Emissary of the Prophets Benjamin Sisko in 2372 (because the Bajorans interpreted this as sign against the Federation and tried to ally with the Cardassian Union). This timeline was avoided due to the intervention of Jake Sisko in 2422. (DS9: "The Visitor")

In Q's anti-time future, the Klingons had conquered the Romulan Star Empire by the late 24th century. (TNG: "All Good Things...")

According to Daniels', the Klingons (re)joined the Federation by the 26th century. (ENT: "Azati Prime")

In the mirror universe, the Klingon Empire became part of the Klingon-Cardassian Alliance, ruling the former Terran Empire with the aid of the Bajorans. (DS9: "Crossover")

See alsoEdit

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